linux-kernel - Re: [PATCH 1/3] net-PPP: Deletion of unnecessary checks before the function call "kfree"

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Date:	Mon, 01 Dec 2014 15:19:08 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>,
	Paul Mackerras <paulus@...ba.org>, linux-ppp@...r.kernel.org,
	netdev@...r.kernel.org
CC:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 1/3] net-PPP: Deletion of unnecessary checks before the
 function call "kfree"

Hello.

On 11/30/2014 7:44 PM, SF Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 30 Nov 2014 17:02:07 +0100

> The kfree() function tests whether its argument is NULL and then
> returns immediately. Thus the test around the call is not needed.

> This issue was detected by using the Coccinelle software.

> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>   drivers/net/ppp/ppp_mppe.c | 14 ++++++--------
>   1 file changed, 6 insertions(+), 8 deletions(-)

> diff --git a/drivers/net/ppp/ppp_mppe.c b/drivers/net/ppp/ppp_mppe.c
> index 911b216..7e44212 100644
> --- a/drivers/net/ppp/ppp_mppe.c
> +++ b/drivers/net/ppp/ppp_mppe.c
> @@ -238,8 +238,7 @@ static void *mppe_alloc(unsigned char *options, int optlen)
>   	return (void *)state;
>
>   	out_free:
> -	    if (state->sha1_digest)
> -		kfree(state->sha1_digest);
> +	kfree(state->sha1_digest);

    Please keep this line aligned to the others.

>   	    if (state->sha1)
>   		crypto_free_hash(state->sha1);
>   	    if (state->arc4)

[...]

WBR, Sergei

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